AC Switchboard Meters – Iron Vane & Rectifier types
Wattmeters
Temperature Indicators
Frequency Meters
Expanded Scale Voltmeters
Wattmeters
Temperature Indicators
Frequency Meters
Expanded Scale Voltmeters
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 | 0.2 HZ @ 398-402 Hz – 0.4 Hz Elsewhere on Dial |
| Accuracy MIL-M- 16125 | NA | 3% of Frequency Span 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 | -65°C to +100°C | -65°C to +100°C |
| Scale Arc | 90° | 250° |
| Meter Movement Specification | MIL-PRF-10304 | MIL-DTL-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) | MIL Spec. | Configuration | |
|---|---|---|---|---|---|
| 3½” Panel | 4½” Panel | ||||
| 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 | Self-Contained |
| 55-65 | 120 ± 6 | - | 4991-001 ** † | MIL-M-16125 | Self-Contained |
| * Equivalent to GE P/N 50-101354APAP4 ** Equivalent Westinghouse 291B270A1 †The internal transducer can and circuitry are identical to A&M Model 4991-008 |
