Giga-tronics 8003, Operation Manual

Page: 217 / 258

Performance Test & Calibration
Manual 20791, Rev. C, June 2001 4-3
4.2 Calibrator Verification Procedure
If any of the instrument performance characteristics are not within specifications, refer the problem to
Giga-tronics Customer Service.
4.2.1 Calibrator Output Power Reference Level
This test determines if the Calibrator Output Power Reference Level given in this section is valid for an
ambient temperature range b5
°
C and +35
°
C (+41
°
F to +95
°
F).
The Calibrator Output power reference is factory adjusted to 1 mW
±
0.7%. To achieve this accuracy,
Giga-tronics uses a precision measurement system with accuracy to
±
0.5% (traceable to the NIST -
formerly the NBS), and allows for a transfer error of
±
0.2% for a total of
±
0.7%. If an equivalent
measurement system is used for verification, the power reference oscillator output can be verified to
1 mW
±
1.9% (
±
1.2% accuracy,
±
0.5% verification system error
, ±
0.2% transfer error, for a maximum
error of
±
1.9%). To ensure maximum accuracy in verifying the Calibrator Output power reference, the
following procedure provides step-by-step instructions for using specified test instruments of known
capability. If equivalent test instruments are substituted, refer to the Key Characteristics section in
Table 4-1.
4.2.1.1 Procedure
In the following steps, thermistor power measurements will be made using the 432A Power Meter. For
detailed information on using the 432A, please refer to the operating section on the 432A manual.
1. Connect the 432A to the Calibrator Output on the 8003 as shown in Figure 4-1.
2. Turn on all equipment and then wait 30 minutes for the thermistor mount to stabilize before
proceeding to the next step.
Figure 4-1: Calibrator Output Test Setup