Heathkit IM-5228 VTVM

[Harvey A. Kader]

I still have to get my new scanner hooked up to my computer. I have the
original instruction manual(1977) for the Heathkit IM-5228.  So for now
I will post the specifications and some quotations from the manual. Ed,
thanks for the tip - I will also post it to the Heathkit Virtual Museum.

The introduction states “The HEATHKIT Model IN-5228 Vacuum Tube
Voltmeter is intended for use by servicemen, engineers, and maintenance
men to make accurate meausurements of DC+, DC- and AC voltages, and
resistance. The design is simple and rugged, yet accurate.’’

“In this instrument, vacuum tubes are used for rectification and
amplification on all measurement functions to insure good sensitivity
and stability of operation(italics mine). Precision resistors are used
in the voltage divider networks to provide high accuracy.”

Specifications


DC

7 Ranges : 0-1.5, 5, 15, 50, 150, 500, 1500 volts full scale; up to
30,000 volts with accessory probe.

Accuracy  : +- 3% full scale.

AC

7 Ranges : 0-1.5, 5, 15, 50, 150, 500, 1500 rms scales(0.353 of peak-to
peak).

Accuracy : +- 5% full scale.

Ohms

7 Ranges : Scale with 10 ohms center X1, X10, X100, X1000, X10K, X100K,
X1MEG. Measures 0.1 ohm to 1000 megohms with internal battery.

DC Input Resistance : 11 Megohms(1 megohm in probe) on all ranges; 1100
with accessory probe.

Meter : 6 inch, 200 microamp movement

Dividers : 1% precision type

Tube Complement : 12AU7 - twin triode meter bridge
                  6AL5  - twin diode rectifier(also uses a silicon diode
power supply rectifier)
Weight : 5 pounds        Reference : Heathkit Manual for IM-5228(1977)

Harvey A. Kader - http://www.angelfire.com/on/vacuumtubes

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