IET Labs SRac Series, User And Service Manual

Page: 16 / 17

8
SRX/SRC Series
8 Maintenance
4.3.3 Required Equipment
Many combinations of standards, transfer stan-
dards, meters, and bridges may be used to calibrate
this instrument. The following are some possible
choices:
• Resistance Standards or Transfer Standards
for the required values with traceable cali-
brations, such as the following standards
available from IET Labs
• SR-102 100
Ω
• SR-103 1 k Ω
• SR-104 10 k Ω
• SRL series
• Precision resistance measurement bridge
or multimeter, with a transfer accuracy
of ±l ppm. Options include:
• Guildline Model 9975
• Measurements
International Model
6010C
• ESI model 242, 242A, 242C, or
242D
• A high-precision, high-stability digi-
tal multimeter (e.g. Fluke 8508A)
along with a set of resistance stan-
dards for ratio mode.
4.3.4 Calibration Procedure
To calibrate an SRac unit, proceed as follows:
1. Set up the calibration equipment in the resis-
tance measurement mode.
2. Con fi rm the resistance of the unit.
3. Con fi rm that the resistance is consistent with
historical measurements.
4.4 Replaceable Parts List
Reference IET Pt No Description
1
BP-1000-RD Binding Post, Red
2
BP-1000-BK Binding Post, Black
3
BP-1000-GN Binding Post, Green
Not Shown
SRac-*-Res SRac resistor assembly
Replace * with nominal resistance value
Table 4-1: Replaceable Parts List
Figure 4-1: SRac Replaceable Parts
1
2
3