Fluke 1595A - Manual (Page 119)

109
Calibration
CALIBRATION PARAMETERS (F5)
9.6.2 Standby Current Check
It may be necessary to check standby current to ensure proper operation. The standby current must be manu-
ally checked. Each channel’s standby current can be checked with the following steps.
NOTE: If a scanner is connected, channel 1 will not be available to test. Power off the Super-
Thermometer and disconnect the scanner in order to test standby current on channel 1.
1. Connect a 100 W resistor to channel 1.
2. Press the SETUP key and disable all other channels except channel 4.
3. Highlight Channel 1 and press CHANNEL SETTINGS (F2). Set REFERENCE RESISTOR to 100
W.
Set SENSING CURRENT to 1.0 mA. Set STANDBY CURRENT to ON.
4. Press and hold the EXIT key to return to the Measurement screen. Select the START MEASUREMENT
(F1) function key. The Channel Select Key should be amber above channel 1 and green above channel
4. The amber color indicates the channel is in the standby current mode. The current can now be
measured by inserting a current meter in series between the C1 or C2 terminal and the 100 W resistor
lead. An alternative method is using a volt meter to measure the voltage drop across the 100-ohm
resistor and then compute the current.
5. Calculate the difference (or error) between the actual 1.0 mA and the measured readings. Error should
be less than +/- 0.05 mA.
6. Repeat steps 1 through 5 for the other channels.