TB 9-6625-388-35
Table 2. Calibration Description - Continued.
Test instrument parameters
Performance specifications
Models ZM-4( )/U, 1-49( ), E3108, and E3207
Power requirements:
1
Internal
4.5 V dc (3 BA-30 batteries)
External
22.5 to 200 V dc (40 ohms per V) current limiting resistor must be
used for voltages in excess of 45 V
Range
1 ohm to 1,011 M Ω
Accuracy
0.25% for ZM-4A/U and ZM-4B/U on orders 19629-P-50 and 6870-P-
51
1
Range
0 to 1,011 k Ω (0.1% +0.01 ohm)
Current limitations
0.016 to 0.5 A
1This
specification is for information only and is not verified in this bulletin.
SECTION II
EQUIPMENT REQUIREMENTS
4. Equipment Required. Table 3
identifies the
specific equipment used in
this
calibration procedure. This equipment is issued with secondary transfer standards
calibration sets NSN 6695-00-621-7877, 4931-00-525-8175 (AN/GSM-256), and 4931-01-
019-1829 (AN/GSM-259)1, and is to be used in performing this procedure. Alternate items
may be used by the calibrating activity when the equipment listed in table 3 is not
available. The items 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 3. The accuracies listed in table 3 provide a four-
to-one accuracy ratio between the standard and TI. Where the four-to-one ratio cannot be
met, the actual accuracy of the equipment selected is shown in parenthesis.
5. Accessories Required. The
accessories listed in table 4
are issued as
indicated in
paragraph 4 above and
are to be
used in this
calibration procedure. When necessary, these
items may be substituted by equivalent items unless specifically prohibited.
Table 3. Minimum Specifications of Equipment Required
Manufacturer, model, and part number
Minimum use
AN/GSM-256 and
Item
Common name
specifications
Level A
AN/GSM-259
A1
DECADE
Range: 1 to 900,000 ohms
Biddle-Gray, Model 601147- Same as level A
RESISTOR
1 (7910328)
Accuracy: 0.03%
1
A2
POWER
Range: 24-30 V dc
New Jersey Electronics,
Same as level A
SUPPLY
Model CS36-CR30
(7907346-2)
A3
RESISTANCE
Bridge range: 1 to 9009.01
Electro Scientific
MEASURING
ohms
Industries, Model 230B
(7912150-2)Electro
SYSTEM
Accuracy: 0.03%
Scientific Industries,
Model 801MOD
Detector resolution: 30 V
(7912151-2)
1Two required (designated decade A and B, as applicable).
4