Boonton Electronic - 250-A - Level Meter
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250-A
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Information
The RX Meter Type 250-A is a wide frequency range Impedance
Meter designed to permit accurate individual determination
of the equivalent parallel resistance and parallel reactance
of two- terminal networks and components. The instrument is
completely self-contained and consists,* fundamentally, of a
refined Schering bridge circuit, together with its
associated oscillator, detector, amplifier, null detector
and power supply. Bridge balance is obtained by means of two
calibrated dials which indicate, respectively, parallel
resistance and parallel capacitance of the unknown.
B. SPECIFICATIONS
1. FREQUENCY RANGE: 0. 5 me to 250 me.
2. RESISTANCE MEASUREMENTS:
a. Range: 15 ohms to 100,000 ohms.
(Values from 0 to 1512 maybe measured indirectly.)
b. Accuracy:
/ ^ Rp Q
± 12 + ---- + ------ + — j % ± 0. 2 ohms
v 200 5000 20/
where f = frequency in megacycles R„ - equivalent parallel
resistance in. ohms indicated by RX Meter
Rp
Q -------
Xp
as determined from RX Meter readings.
3. CAPACITANCE MEASUREMENTS:
a. Range: 0 to 20 mmf. (May be extended to 120 mmf by use of
auxiliary resonating coils.)
b. Accuracy:±(0.5 ^ 0.5F2 *C*x 10-5)% ±-0.15/ifrf *F =
frequency (MC); C = RX Meter Cp reading (^f)
where f - frequency in megacycles.
4. INDUCTANCE MEASUREMENTS:
a. Range: Inductance values which will resonate with
capacitance from 0.1 mmf to 100 mmf over the frequency range
of the instrument. By the use of auxiliary series resistors
or capacitors, values of inductance maybe measured over the
following ranges.
Freq. Minimum Maximum
0.5 me 0* Ol^h 100 mh
250 me O.OOljuh 0.4 mh
5. VOLTAGE AT TEST TERMINALS:
DC voltage = 0. (DC up to 50 ma. may be passed thru the
terminals from external source.) RF voltage = approximately
0.1 to 0.5 volts.
6. POWER REQUIREMENTS:
Voltage, 105-125 volts? frequency, 50-60 cps, power
consumption,60 watts. (Voltage internally regulated.)
1 Manual
Service and user manual
Manual type:
Service and user manual
Pages:
36
Size:
3.1 MB
Language:
english
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Manual-ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
Jan. 22, 2017
MD5:
86534b3d-2277-3799-3e46-3036f8b9b96a
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421