Keithley 2700, Service Manual

Page: 39 / 174

Performance Verification 1-23
2. Install the Model 7700 in Slot 1 of the Model 2700, then turn on the power, and allow
the unit to warm up for two hours before proceeding. Be sure the front panel INPUTS
switch is set to the REAR position.
3. Select the DC current measurement function by pressing the DCI key.
4. Set the Model 2700 for the 20mA range. Close Channel 21 by pressing the CLOSE key,
and keying in 121.
5. Source positive and negative full-scale currents for each of the ranges listed in
Table 1-11 , and verify that the readings for each range are within stated limits.
6. Press the OPEN key to open Channel 21.
Table 1-11
Plug-in module DCI limits
DCI range Applied DC current* Reading limits (1 year, 18°C to 28°C)
20mA
100mA
1A
3A 20.0000mA
100.0000mA
1.000000A
3.000000A** 19.89960 to 20.01040mA
99.9100 to 100.0900mA
0.999160 to 1.000840A
2.99628 to 3.00372A
* Source positive and negative currents with values shown.
** If the Fluke 5725 amplifier is not available, apply 2.2A from calibrator. Reading limits for 2.2A
input are: 2.197240 to 2.202760A.