5
¼ amp 3AG type. If the new fuse also blows, return the complete unit to ETS for
repair.
A repair authorization must first be obtained from ETS prior to returning the
instrument for service.
7.0 CALIBRATION
The Model 252C calibration may easily be checked by the user by connecting standard
1% resistors, whose values are listed below, between the input connector and the
pushbutton.
SWITCH POSITION
MUST FAIL MUST PASS
Lower Limit –: Wrist Strap and Footwear
(Nominal is 750K ± 5%)
<712.5K >787.5K
Upper Limit – Strap Only:
(Nominal is 1.25M ± 5%)
>1.3125M <1.1875M
Upper Limit – Strap + Wearer:
(Nominal is 10M ± 5%)
>10.5M <9.5M
Upper Limit – Footwear:
(Nominal is 100M ± 10%)
>110M <90M
(The above specifications are calculated. Tolerance on resistors used in ETS test
fixtures is 1%)
If the unit does not meet specification, it should be returned to Electro-Tech
Systems for repair or recalibration.
Custom units with other resistance limits can be tested by selecting 1% resistors
whose values are within 3% of either side of the nominal limits specified.
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