TTI QL II Series, Service Manual

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2
Specification
General specifications apply for the temperature range 5°C to 40°C. Accuracy specifications apply
for the temperature range 18°C to 28°C after 1 hour warm-up with no load and calibration at 23°C.
Typical specifications are determined by design and are not guaranteed.
MAIN OUTPUTS
Voltage/Current Ranges: QL355 QL564
0V to 35V/0·001A to 3A
0V to 35V/0·1mA to 500mA
0V to 15V/0·001A to 5A 0V to 56V/0·001A to 2A
0V to 56V/0·1mA to 500mA
0V to 25V/0·001A to 4A
Voltage Setting: Resolution 1mV
Accuracy ± (0·03% + 5mV)
Current Setting: Resolution 1mA; 0·1mA on 500mA range
Accuracy ± (0·2% + 5mA); ± (0·2% + 0·5mA) on 500mA range.
Output Mode: Constant voltage or constant current with automatic cross-over.
CI indicator lit in constant current mode.
Output Switch: Electronic, non isolating. Switch illuminated when Output on.
Preset voltage and current limit displayed when Output off.
Output Terminals: Universal 4mm safety binding posts on 19mm (0·75”) pitch for Output;
screwless terminals for Sense.
Duplicate rear panel Output and Sense screw terminals on P models.
Transient Response:
<50
µ
s to within 15mV of set level for a change in load current from full
load to half load or vice versa.
Voltage Programming
Speed: Maximum time required for output to settle within 1% of its total
excursion (for resistive load). Excludes command processing time.
QL355 QL564
Full Load No
Load Full Load No
Load
Up
Up
Up
15V 5A
35V 3A
35V 500mA 6ms
20ms
200ms 6ms
7ms
40ms 25V/4A
56V/2A
56V/500mA 10ms
40ms
300ms 6ms
15ms
60ms
Down
Down
Down
15V 5A
35V 3A
35V 500mA 6ms
25ms
120ms 250ms
600ms
600ms 25V/4A
56V/2A
56V/500mA 10ms
50ms
200ms 400ms
800ms
800ms
Ripple and Noise
(20MHz bandwidth): Normal mode voltage: <0·35mVrms and 2mVp-p
Normal mode current: <0·2mArms; <20
µ
Arms on 500mA range.
Load Regulation: For any load change, measured 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.
Specification applies for sense lead resistance <0·5
Ω
.
Line Regulation: Voltage <0·01% + 2mV for 10% line change.
Current <0·01% + 250µA; <0.01%+ 50µA on 500mA range.
Temperature Coefficient: Voltage: typically <(50ppm + 0·5mV)/°C
Current: typically <( 1mA)/°C;
typically<( 0·1mA)/°C on 500mA range.
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.