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DOD Information

 

Model Number Description
DC Switchboard Meters
AC Switchboard Meters - Iron Vane & Rectifier types
Wattmeter's
Synchroscopes

Power-Factor Meters
Temperature Indicators
Frequency Meters
Voltmeters
Standard Features
General Specifications
Options

 

Frequency Meters

Drilling Plan 

 

Specifications

Model 369

Model 4991

Accuracy

MIL-M-23167

0.2 HZ @ 398-402 Hz – 0.4 Hz Elsewhere on Dial

MIL-M-16125

NA

3% of Frequency on Dial

Resolution

0.2 Hz / Scale Division

0.1 Hz per Scale Division

Insulation Resistance

2600 Megohms Minimum

2600 Megohms Minimum

Over-Voltage

135% of Rated Voltage 15 Minutes

135% of Rated Voltage 15 Minutes

Burden

5 Volt-Amperes

5 Volt-Amperes

Storage

-65C to +100C

-65C to +100C

Scale Arc

90

250

Meter Movement Specification

MIL-M-10304

MIL-M-16034

Vibration

MIL-STD-167

MIL-STD-167

Shock

MIL-S-901

MIL-S-901


Scale Range (Hz)

Voltage Input Range (VAC)

Model Number
(Military Designation)
3” Panel         4” Panel

MIL Spec.

Configuration

395-405

120 6

369-037
(MR38W41AFH)

4991-001
(MR49W41AFH)

MIL-M-23167

Self-Contained

395-405

450 12

369-038
(MR38W42AFH)

4991-002
(MR49W42AFH)

MIL-M-23167

Self-Contained

395-405

208 10

369-039
(MR38W43AFH)

4991-003
(MR49W43AFH)

MIL-M-23167

Self-Contained

395-405

220 11

369-040
(MR38W44AFH)

4991-004
(MR49W44AFH)

MIL-M-23167

Self-Contained

395-405

440 22

369-041
(MR38W45AFH)

4991-005
(MR49W45AFH)

MIL-M-23167

Self-Contained

59-61

120 6

-
-

4991-010
(MR49W60AH)

MIL-M-16125

Self-Contained

55-65

120 6

-
-

4991-008
(MR49W60BH)

MIL-M-16125

Self-Contained

350-450

120 6

-
-

4991-012
(MR4W400DH)

MIL-M-16125

Self-Contained

55-65

120 6

-
-

4991-006
* †

MIL-M-16125

Matched Set

55-65

120 6

-
-

4991-001
** †

MIL-M-16125

Matched Set

* Equivalent to GE P/N 50-101354APAP4    ** Equivalent Westinghouse 291B270A1
The internal transducer can and circuitry are identical to A&M Model 4991-008

 

 

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