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Note - This is a bargain basement item which may not be fully refurbished, tested, or accessorized like our standard reconditioned items. The pictures shown are generally of the item you will receive unless we have multiple pieces in stock in identical condition. See below for specific terms of this item. The listed price reflects the terms shown however if you require additional service, warranty, or accessories please use the make offer button and let us know what you need.
MFR / Model: Genrad 1840-A output power meter.
Condition: As Pictured. Scuffs and scratches. Meter face plastic is cracked. Plastic on one of the binding posts is cracked.
Testing Performed: Tested good.
Warranty: 10 day right of return if not working properly
Accessories Included: none
MFR Description:
This instrument is basically a multi-tapped audio-frequency transformer with a fixed secondary load. Its two front-panel switches connect eight identical primary windings and six secondary taps in various combinations to provide a total of 48 different primary impedances.
The maximum power rating can be extended for any given impedance with the use of simple T-network attenuator, design data for which are supplied with the instrument.
Power Range:
0.1 mW to 20 watts in five ranges, 40 Hz to 20 kHz; maximum rating is
reduced by up to 50% (at 25 Hz), depending on impedance selected.
An auxiliary dB scale on the meter reads from -15 to +3 dB, referred to 1 mW.
Impedance Range:
0.6 Ω to 32 kΩ in two ranges; yielding 48 individual impedances spaced approximately 2 apart.
Accuracy
Impedance:
at 1 kHz, ±6% max, -0.5% avg;
70 Hz to 2.5 kHz, ±7% above 10 kW;
70 Hz to 5 kHz, ±7% below 10 kW;
at 20 Hz, -15% max, -8% avg;
at 20 kHz, ±50% max, ±12% avg
When impedance is specified, accuracy applies at full-scale on all ranges and impedances at 1 kHz;
when frequency ranges are specified, accuracy is at full-scale at ranges ≥20 mW at the specified impedances.
When a frequency limit is specified, accuracy is at full-scale at all impedances
Power:
at 1 kHz, ±0.3 dB;
50 Hz to 6 kHz, ±0.5 dB;
30 Hz to 10 kHz, ±1 dB;
at 20 Hz, -1.5 dB max, -1 dB avg;
at 20 kHz, -5 dB max, ±1.5 dB avg.
Waveform Error:
Meter will indicate true rms with as much as 20% second and third harmonics present in the input signal.
General Radio 1840-A
