Instruction manual

DLS100
World Precision Instruments 9
Adjusting the DC Offset
The DLS100 DC offset must be adjusted for both the even and odd channels. Adjust
the even channels first, because they are subject to the adjustment of the odd
channels. This calibration involves two potentiometers. POT1 is for even channels
on the DS8000, and POT2 is for odd channels.
CAUTION: DS8000 MUST be powered off before attaching the DLS100.
1. Connect the DLS100 to the DS8000 channel 2 output (9-pin connection).
2. Power on the DS8000.
3. On the DS8000, program channel 2 in DC mode for 0.00V amplitude. Select
both the Run and Output check boxes on the DS8000 panel.
4. Plug the 10KW dummy test resistor (WPI #83017) into the Output (red and black
mini-banana connectors) to the top of the DLS100.
5. Set the DLS100 to the current range you intend to use by pressing the desired
Range button. The 1mA range is sufficient. The 10mA range may also be used,
but it is much more difficult to adjust to zero.
6. Press the On/Off button to turn the DLS100 output on. Allow the unit to warm
up for 30 minutes before adjustment continues.
7. Turn the DLS100 face down and remove the two black plugs covering POT1 and
POT2 (Fig. 7).
Even Channel
Adjustment (POT1)
Audible Alarm
Switch
Odd Channel
Adjustment (POT2)
Fig. 7–POT1 and POT2 are located on the underside of the DLS100 and are covered by
small black plugs
8. Use a high quality digital volt meter with a scale greater than 20MW. Set the
meter in the millivolt scale and monitor the output voltage at the top of the load
resistor.