TB 9-6625-2021-35 
4 
SECTION II 
EQUIPMENT REQUIREMENTS 
4. Equipment Required.  Table 2 identifies the specific equipment to be used in this 
calibration procedure.  This equipment is issued with  Secondary Transfer Calibration 
Standards Set AN/GSM-286.  Alternate items may be used by the calibrating activity.  The 
item selected must be verified to perform satisfactorily prior to use and must bear evidence 
of current calibration.  The equipment must meet or exceed the minimum use specifications 
listed in table 2.  The accuracies listed in table 2 provide a four-to-one ratio between the 
standard and TI.  
5. Accessories Required.  The accessories required for this calibration are common 
usage accessories, issued as indicated in paragraph 4 above, and are not listed in this 
calibration procedure. 
Table 2.  Minimum Specifications of Equipment Required 
 
Common Name 
 
Minimum use specifications 
Manufacturer and model 
(part number) 
AUTOTRANSFORMER  Range: 105 to 125 V ac  General Radio W10MT3AS3 
 (7910809) or Ridge, Model  
 9020A (9020A), or Ridge,  
 Model 9020F (9020F) 
FREQUENCY  
 DIFFERENCE METER 
Accuracy: <±1.25 parts in 10
10
 
Tracor, Model 527E (527E) 
FUNCTION 
GENERATOR 
Function:  Sinewave, 50Ω 
Frequency:  10 Hz to 10 MHz 
Amplitude:  1 to 200 mVp-p 
(SG-1288/G) 
 
MULTIMETER  Range: -14.95 to +15.05 V dc 
Accuracy: ±0.08% 
John Fluke, Model 8840A/AF 
 (AN/GSM-64D) 
SIGNAL GENERATOR  
 
Frequency:  10 MHz to 18 GHz 
Amplitude:  -50 to –13 dBm   
Wiltron, Model 68347M 
TIME/FREQUENCY  
 WORKSTATION 
Frequency:  1 MHz 
Accuracy: <± 1.0 part in 10
11 
 
Autek Systems Corp., Model 
 620 (MIS-38946)