Calibration Procedure - Tektronix 067-0883-99 Instruction Manual

UNIVERSAL LOAD UNIT
Note: Remove any Program Plug-in which may be installed.
The positions of the HI/LOW/IND and MAX/MIN controls are of no
consequence.
5. Turn On: The power supply and adjust it for 10.0±0.1 VDC
as measured by the external DMM.
6. (Before each measurement) Pull Out:
The Current Adjust
push pull switch.
Adjust: The CURRENT ADJUST control for 1.00±0.05 Amps as
measured on the external (series) DMM.
7.
(For each measurement) Compare:
The readings on the U.L.U. Panel DMM
to those on the external meters, in both the "Voltage" and "Current"
positions of the VOLTAGE/CURRENT switch, for positions 1 thru 12 of the
CHANNEL SELECT switch. The U.L.U. Panel Meter should agree with the
external (voltage) DMM reading to within ±0.012 VDC. The current
readings should be the values indicated in the Verification Test Table.
8. (After each measurement) Reset:
The external power supply to OFF,
(before it is disconnected and moved to the next channel),
the CURRENT ADJUST push-pull switch to its "in" position,
and the COARSE and FINE controls both to their mid-rotation position.
CALIBRATION PROCEDURE
1. Power Supply
Set Up
1. Remove: The U.L.U.'s side covers and any plug-in.
2. Set: The LINE SELECT switch (on the back) to the appropriate
position and the POWER switch to the "On" position.
3. Use:
Pin probes to reach the signals called out in Table 4-2,
Power Supply Calibration, entering from the rear of the
specified plugs and pins.
Refer:
To Figure 4-2 for the locations of the plugs and pots
which are called out in Table 4-2.
4-4