expands the tour into its own window (only visible when embedded in another page.)QL Series II Technical Specifications
QL Series II DC Supplies
- Advanced DC power supplies, single or triple output
- Very high precision, very low noise, excellent dynamics
- Advanced user interface with numeric and rotary control
- Multiple voltage/current ranges for increased flexibility
- Multiple non-volatile memories for power supply set-ups
- Switchable remote sense provides perfect load regulation
- Comprehensive protection including OVP and OCP trips
- Compact bench footprint; modular width for rack mounting
- Auxiliary output fully variable 1.00V to 6.00V at 3A with selectable voltage and current metering (T models)
- Bus programmable via USB, RS232 or LAN (P models) LAN interface is LXI class C compliant
- GPIB available as a factory fit option on P-G models
- Duplicate power and sense terminals at rear (P and P-G models)
Model Naming Convention
- QL = QL Series
- First two digits are maximum volts from a single output
- Third digit maximum current from a single output
- T suffix indicates Triple Output
- P suffix indicates Programmable (remote interfaces)
- -G suffix indicates GPIB option fitted
TECHNICAL SPECIFICATIONS
| MAIN OUTPUT(S) | |
|---|---|
| QL355, QL355P, QL355P-G, QL355T, QL355TP, QL355TP-G | |
| Max. Output Power | 105 watts |
| Output Ranges |
Range 1 - 0 to 35V, 0 to 3A Range 2 - 0 to 15V, 0 to 5A Range 3 - 0 to 35V, 0 to 500.0mA |
| QL564, QL564P, QL564P-G, QL564T, QL564TP, QL564TP-G | |
| Max. Output Power | 112 watts |
| Output Ranges |
Range 1 - 0 to 56V, 0 to 2A Range 2 - 0 to 25V, 0 to 4A Range 3 - 0 to 56V, 0 to 500.0mA |
| All Models | |
| Voltage Setting | By floating point numeric entry or rotary jog wheel; resolution 1mV |
| Current Setting | By floating point numeric entry or rotary jog wheel; resolution 1mA or 0.1mA depending on range |
| Setting Accuracy | Voltage - 0.03% ±5mV Current 0.2% ±5mA/0.5mA |
| Output Mode | Operation in constant voltage or constant current modes with automatic cross-over and mode indication |
| DC Output Switch | Sets output voltage and current levels to zero when Off |
| Output Terminals | 4mm safety binding post terminals on 19mm (0.75") spacing. Duplicated on rear terminal block (P and P-G versions only) |
| Load Regulation | For any load change, at the output terminals, using remote sense,
Voltage <0.01% + 2mV. Current <0.01% + 250µA; <0.01% +50µA on 500mA range. (Add typically 2.5mV for a 0.5V drop in the positive output lead.) |
| Line Regulation | Voltage <0.01% + 2mV for 10% change.Current <0.01% +250µA; <0.01%+ 50µA on 500mA range |
| Ripple and Noise | Typically <0.35mV rms CV mode, and <0.2mA rms CI mode (<20µA rms on 500mA range) |
| Common Mode Noise Current | <4µA rms at 20MHz bandwidth |
| Transient Response | <20usec to within 15mV of setting for 90% load change |
| Temperature Coefficient | <(50ppm+0.5mV)/ °C (voltage), <(100ppm+1mA/0.1mA)/°C (current) |
| Remote Sense | Eliminates up to 0.5V drop per lead. Remote sense operation selected from front panel and indicated by LED |
| Sense Terminals | Recessed sprung sockets for direct insertion of wires. Duplicated on rear terminal block (P and P-G versions only) |
| OUTPUT PROTECTION | |
|---|---|
| Output Protection | Output will withstand forward voltages of up to 20V above rated output voltage. Reverse protection by diode clamp for currents up to 3A |
| Fault Condition Trip | The output will be shut down if any of the four trip conditions listed below occur. (In addition to the output being set to Off, an isolated rear panel signal is also activated.) |
| Over Voltage (OVP) | Settable 1V to 40V (QL355) or 60V (QL564) in 0.1V steps |
| Over Current (OCP) | Settable 0.1A to 5.5A (QL355) or 4.5A (QL564) in 0.01A steps |
| Over Temperature | Monitors internal temperature rise to protect against excess ambient temperature or blocked ventilation slots |
| Sense Error | Monitors the voltage between the remote sense terminals and output terminals to protect against mis-wiring |
| Trip Output Signal | Isolated open-collector output signal on rear panel |
| METERING | |
|---|---|
| Display Type | Dual digital displays per output using 14mm (0.56") high brightness LEDs. 5 digits for voltage, 4 digits for current. Update rate 4 per second. |
| Meter Function | Voltage meter shows set voltage when in CV mode and measured voltage when in CI mode. Current meter shows measured current when in CV mode and set current when in CI mode. |
| Limits Display | With the DC output switch set to Off, both meters show the set values (i.e. the limits). With the output On, either the voltage meter or current meter will show a measured value (depending on the CV/CI mode). Pressing the Limits button will provide a temporary display of the set values. |
| Watts (VxA) Display | The voltage meter can be made to show the calculated product of voltage and current |
| Meter Resolution | |
| Voltage | 1mV (CV mode) or 10mV (CI mode) |
| Current | 1mA or 0.1mA depending on range |
| Power | 0.01W or 0.001W depending on range |
| Meter Accuracy | |
| Voltage | 0.1% of reading ±10 mV (CI mode) |
| Current | 0.2% of reading ± 0.005A or 0.5mA (CV mode) |
| Power | 0.3% of reading ± 0.05W or 0.005W |
| SETTINGS MEMORIES | |
|---|---|
| Main Output(s) | Up to 50 set-ups per output can be saved and recalled via the keyboard or remote interfaces where fitted. |
| Parameters Stored | Range, Set volts, Set current, OVP, OCP |
| Recall system | Settings are previewed onto the displays before being actioned |
| Linked Mode | On triple output models when in Linked mode, a further set of 50 memories stores and recalls values for both outputs simultaneously |
| Auxiliary Output | Up to 10 voltage settings can be saved and recalled via the keyboard or remote interfaces |
| ALARM OUTPUT |
|---|
| Isolated rear-panel open-collector output signal. User can select output to be activated for either OVP, OCP, Overtemperature or Sense miswiring, or for any of those four faults. |
| LINK & COPY |
|---|
| (Triple Output Models - T suffix in model name)
Each output can be controlled independently or can
be linked. When linked, keyboard and jog wheel control operates on both
outputs simultaneously. Linked mode can be used to create tracking outputs, or for convenient series or parallel operation of the two outputs. A Copy function is available which copies all of the settings for output 1 to output 2 (Range, Set volts, Set current, OVP, OCP). Linked mode can also be used to store the settings for both outputs to a group of common memory stores when simultaneous recall is required. (Note: Linked mode can be selected with differing voltage and current settings on the two outputs. However both outputs must be set to the same range.) |
| AUXILIARY OUTPUT | |
|---|---|
| (Triple Output Models only) | |
| Output Voltage | 1.00 to 6.00V |
| Output Current | >3.0 A maximum. LED indication of over-current |
| DC Output Switch | Sets output voltage level to zero when Off |
| Setting Accuracy | 0.5% ±10mV |
| Ripple and Noise | <2mV rms, 10mVp-p |
| Load Regulation | < 1% for 90% load change |
| Line Regulation | < 0.1% for 10% line change |
| Meter Accuracy | Voltage 0.5% ±10mV, Resolution 10mV Current 0.5% ±10mA, Resolution 10mA |
| Output Regulation | Switch-mode down converter |
| Output Protection | Output will withstand up to 16 V forward voltage. Diode clamped for reverse voltages and 1 Amps reverse current |
| Output Terminals | 4mm safety binding post terminals on 19mm (0.75") spacing. Duplicate screwless terminals at rear (P and P-G versions only) |
| DIGITAL BUS INTERFACES | |
|---|---|
| P suffix indicates Programmable Full remote control and read-back using RS-232, USB, or LAN (compliant with LXI class C). Prior to 2024 P models had GPIB as standard. From 2024 it became a factory fit option (P-G models). All interfaces are at ground potential and opto-isolated from the output terminals | |
| RS-232 | Standard 9-pin D connector. Baud rate variable 600 to 19,200 |
| USB | USB 2.0 connection (backwards compatible with USB 1.x). Operates as a virtual COM port |
| Ethernet (LAN) | Standard 10/100 base-T hardware connection. ICMP and TCP/IP Protocol for connection to Local Area Network or direct connection to a single PC |
| LXI Compliance | LAN interface is compliant with LXI class C. (LXI is the abbreviation for LAN eXtensions for Instrumentation). For more information please see our LXI page |
| GPIB (IEEE-488) | The interface conforms with IEEE-488.1 and IEEE-488.2 (P-G models only) |
| DIGITAL PROGRAMMING PERFORMANCE | |
|---|---|
| (P and P-G versions only) | |
| Voltage Setting - Main Output(s) | |
| Resolution/Accuracy | 1mV / ± (0.03% +5mV) |
| Current Setting - Main Output(s) | |
| Resolution/Accuracy | 0.1mA / ± (0.2% +5mA) or 0.01mA / ± (0.2% +0.5mA) on 500mA range |
| Voltage Setting - Auxiliary Output (Triple Output Models) | |
| Resolution/Accuracy | 10mV / ± (0.5% +10mV) |
| Programming Speed | |
| Command Delay | Typically <25ms (this must be added to any of the figures below) |
| Voltage Up Time | <10ms* to 1% |
| Voltage Down Time | <40ms* to 1% (full load); <0.6s* to 1% (no load) |
| * The up and down times vary with range and voltage step size. More information is contained in the operating manual | |
| DRIVER SOFTWARE SUPPLIED (P and P-G versions only) | |
|---|---|
| IVI Driver | An IVI driver for Windows is available as a download.
This provides support for common applications such as LabView, LabWindows, HPVEE etc. |
| USB Driver | Windows 10 and later will automatically use its own USB CDC driver. A standard Windows USB driver for older versions of Windows is available as a download. |
|
LabView and LabWindows are trademarks of National Instruments. HPVEE (AKA Agilent VEE and now Keysight VEE) is a trademark of Keysight Technologies. Windows is a trademark of Microsoft. | |
| KEYBOARD & ROTARY CONTROL |
|---|
| All functions, including the selection and set-up of the remote control interfaces, can be set from the keyboard. The rotary jog control can be used to adjust output voltage and current settings in a quasi-analogue mode. |
| GENERAL SPECIFICATIONS | |
|---|---|
| AC Input | 230V AC or 115V AC ± 10%, 50/60HzInstallation Category II |
| Input Power | Single - 250VA max. Triple - 500VA max |
| Temperature & Environmental | |
| Operating Range | +5°C to +40°C, 20% to 80% RH |
| Storage Range | -40°C to + 70°C |
| Environmental | Indoor use at altitudes up to 2000m, Pollution Degree 2 |
| Cooling | Intelligent variable-speed fan. Over-temperature trip shuts down output if internal temperatures exceed predetermined thresholds. |
| Safety & EMC | |
| Safety | Complies with EN61010-1 |
| EMC | Complies with EN61326 |
| PHYSICAL | |
|---|---|
| Size | |
| (size excludes feet, knobs and terminals) | |
| Single | 140 x 160 (1/3 rack, 4U) x 290mm |
| Triple | 280 x 160 (2/3 rack, 4U) x 290mm |
| Weight | |
| Single | 5.5kg (12lb) |
| Triple | 10.5kg (23lb) |
| OPTIONS | |
|---|---|
| Rack Mount | RM410 19 inch 4U mount for up to three single output units or one triple plus one single. Blanking plates are supplied for unused sections. |
Accuracy specifications apply for the temperature range 18°C to 28°C after one hour warm-up.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development and reserves the right to alter specifications without prior notice.