Input: MICROPHONE: Lead-ziconate-titanate
ceramic.
Output: > 1.2 Vrms behind 620 Ω with meter at full
scale; will drive
oscilloscope or low-impedance headphones.
Harmonic Distortion:
< 0.5% (0.1% typical) from 32 Hz to 8 kHz, C-weighted with
meter at full scale. Any load impedance may be connected.
Calibration: Can be pressure calibrated at 125, 250,
500, 1000, and
2000 Hz with
GR 1562 Calibrator, and at 1000 Hz with GR
1987*.
Environmental:
Temperature: -10 to 50°C operating: -40 to +60°C
storage, with batteries removed;
Coefficient of sensitivity ~ +0.02 dB/°C at 6 dB
below full-scale meter reading.
Humidity: 0-90% RH within 0.5 dB.
Magnetic Field: 1 oersted (80 A/m) 50- or 60- Hz
field causes about 45 dB C-weighted (negligible A-weighted)
indication when meter is oriented for maximum sensitivity to
fi eld. A 1-oersted, 400-Hz field causes about 58 db
A-weighted indication when meter is oriented for maximum
sensitivity. Vibration: With the microphone attached,
the highest meter indications (without interference from
background noise) when the instrument is vibrated at an
acceleration of 0.1 g, are 67 dBA at 63 Hz, 68 dBA at 250
Hz, and 70
dBA at 1000 Hz. When the microphone is replaced by an
equivalent
impedance, the same test gives no meter indication.
Supplied: Microphone safety cap, instruction manual,
carrying case.
Power: Two 9V alkaline batteries (NEDA 1604AC)
supplied, provide
50 hours of operation.
Mechanical: Shielded plastic case
Dimensions: 16.5 cm H x 0.92 cm W x 0.53 cm D (6.5" x
3.63" x 2.09").
Weight: 0.48 kg (13 oz) net, 1.4 kg (3 lb) shipping.
* At 125, 250, 500, 1000, 2000, and 4000 Hz with GR 1986
Calibrator.
