Theta Voltmeter Phase Sensitive C By clicking "Accept All Cookies", you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. Don't have an account? Sign Up. Already have an account? It is supplied with a calibration data sheet showing the accuracy on each range similar to the photo shown. This Heathkit IM11 is in very good cosmetic condition. The instrument case did not need repainting.
It does not interfere with reading the scales. Ever notice how most sellers of used VTVMs list their items? I have also been refurbishing and selling VTVMs on ebay for years. Every VTVM I sell always 1 has probes, 2 has a manual, 3 is fully calibrated, 4 is guaranteed and 5 can be returned if buyer is not satisfied. In addition, my refurbished VTVMs have had many improvements added. The last photo shows my electronics lab and the equipment I use to test and calibrate the meters I sell.
A Heathkit IM is shown being calibrated. The selenium rectifier and electrolytic filter capacitor were replaced with a silicon diode and new capacitor. The ohms circuit was modified to eliminate the ohms battery see photos.
This improves accuracy, particularly on the low ranges, by eliminating the problem of poor contact between the ohms battery and its holder. It also eliminates one of the biggest problems with these instruments, internal damage caused by a leaking battery. The ac volts circuit was modified to eliminate the 6AL5 tube, replacing it with two volt silicon diodes see photo.
This eliminates the problem of zero drift on the low ac volts range caused by varying contact potential in the vacuum tube diode. If not satisfied, return within 14 days for a full refund of the purchase price. Buyer must pay return shipping costs. It was the successor of the V-7 that was only produced during , that in turn was the successor of the V In the V-7A was replaced by the IM There is only minor differences between the V-7A and the IM The circuitry is very similar in all the VTVM's.
The V-7 was the first with the components mounted on a printed circuit board. I have slightly modified my V-7A. Probe Diagram and schematic. Probe Description, diagram and schematic. High Voltage Probe Assembly. Demodulator Probe Diagram and schematic. Demodulator Probe Description, diagram and schematic. Low Capacity Probe Description, diagram and schematic. Audio Amplifier Schematic only.
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Audio Equalizer Schematic only. Stereo-4 Decoder Complete manual. Audio Frequency Meter Schematic and specifications. Audio Generator Complete manual. Audio Generator Complete Manual.
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Microphone Complete Manual. Vibrator Power Supply Partial Manual.
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