Chapter 3 Calibration Procedures
Constant Current (CC) Verifications
56
Constant Current (CC) Verifications
Constant Current Test Setup
Follow the general setup instructions in the ‘‘Measurement Techniques’’
section, starting on page 50 and the specific instructions will be given in the
following paragraphs.
Current Programming and Readback Accuracy
This test verifies that the current programming and GPIB or RS-232 readback
functions are within specifications. Note that the readback values over the
remote interface should be identical to those displayed on the front panel. The
accuracy of the curr ent monitor ing resi stor mu st be 0.01% or better.
You s houl d p ro gra m t h e powe r su p p ly o v er t he re mo te i nt e rfac e f o r t hi s te st
to avoid round off errors.
1
Turn off the power supply and connect a 0.01
Ω
current monitoring resistor
(R
M
) across the output to be teste d and a digital voltmeter across the current
monitoring resi stor (R
M
).
2
Turn on the power supply. Select the 8V/20A* or 25V/7A** range and enable
the output by sending the commands:
VOLT:RANG P8V (E3633A)
VOLT:RANG P25V (E3634A)
OUTP ON
3
Program the output voltage to full rated voltage (8.0 V)* or (25.0 V)** and
output current to zero amps by sending the commands:
VOLT 8 (E3633A)
VOLT 25 (E3634A)
CURR 0
4
Divide the voltage drop (DVM reading ) across the current monit oring resistor
(R
M
) by its resista nce to convert to amps and record this value (I
O
). This value
should be within the limit of (0 A ± 10 mA). Also, note t hat the
CC
,
Adrs
,
Limit
,
and
Rmt
annunciators are on.
5
Readback the output current over the remote interface by sending the
command:
MEAS:CURR?
*For Agilent E3633A Model **For Agilent E3634A Model
To Next Page
Loading...
Need help?
General
