User Guide

Page 6
CALIBRATION
(1) Calibration Preparation
(1.1) This procedure consists of the following sections.
(1) Calibration Preparation
(2-6) Adjustments
(7) Disassembly and Component Layout
(8) Trouble-shooting
(9) List of spare parts
(1.2) Adjustment procedure will require the following tools and fixed standards
Prepare following items for adjustment.
Oscilloscope, 20 MHz or better. See Figure 1
General resistors @ .5% or better (0.1/10/20/200/1000),
Wire of fixture to form a loop circuit with each of the resistors as part of the loop. See Figure 2
Calibrated current source .1mA to 30A, with an accuracy of 0.5% or better.
Figure 1: Oscilloscope to check waveforms
(1.3) Connect the probe and alligator clip of the oscilloscope as shown in figure one to form a circle (Short the
input to common or ground of the scope).
(1.4) Connect a wire and each general resistor (0.1/10/20/200/1000) like a circle respectively.
Construct the loop using low
resistive wire. Minimize
connectivity resistance
Figure 2
(1.5) Open and close the jaws of 61-920 several times, and confirm that the jaws close by themselves.
(1.6) Use care in removing front panel decal. The adjustment locations shown in Figure 3 are located
underneath the decal. Note: plastic switch extensions will be loose with the decal removed.
Form number TM61920 Rev 4 July 2008