IT-2240 DIGITAL LC BRIDGE

The Heathkit IT-2240 Digital LC Bridge is designed for
easy measurement of inductance and capacitance, and their
associated loss (dissipation) factor. Its accuracy and
operational features can fulfill the requirements of a
laboratory, a quality assurance department, or an experimenter.
The clearly labeled front panel lets even untrained users
make error-free measurements.

SPECIFICATIONS

Accuracy specifications apply at 22C (72F) after a 10 minute warm-up.

L (INDUCTANCE)

Ranges. . . . . . . . . . . . . . . . . . 200 uH to 2000 H; 8 decades

Accuracy (+/- 4 counts)*. . . . . . . . . +/- [.5% (L) + [1.5% (L) x D + .5 ?H]
					  for readings from 10 to 2000 counts when
					  the Bridge is calibrated using laboratory standards

Excitation. . . . . . . . . . . . . . . . 1000 Hz sinusoidal: 80 mA on 200 uH range decading
					  to 8 ?A on 2 H range.
					  120 Hz sinusoidal: 6 uA on 20 uH range; .6 uA on
					  200 H, 2000 H ranges.

Impedance Model . . . . . . . . . . . . . Series R, L equivalent

C (CAPACITANCE)

Ranges. . . . . . . . . . . . . . . . . . 200 pF to 2000 uF; 8 decades

Accuracy (+/- 2 counts)*. . . . . . . . . +/- [.5% (C) + [1.5% (C) x D + .5 pF]
					  for readings from 10 to 2000 counts when
					  the Bridge is calibrated using laboratory standards

Excitation. . . . . . . . . . . . . . . . 1000 Hz sinusoidal: .8 VAC on 200 pF to 2 uF ranges

Impedance Model . . . . . . . . . . . . . Parallel R, C equivalent

DC Bias . . . . . . . . . . . . . . . . . +/- .01 VDC to 10 VDC may be applied via rear
					  terminals. Up to 50 VDC may be applied using
					  eternal circuitry.

D (DISSIPATION)

Ranges. . . . . . . . . . . . . . . . . . 000 to 1.999, limited to D x uF = 1000 on 2000 uF range

Accuracy (+/- 20 counts)* . . . . . . . . +/- 3% for value displays greater than 200 counts

GENERAL

Measurement Connection. . . . . . . . . . Front panel slotted inputs accommodate
					  leads up to 1/16” in diameter and 2-1/2”
					  apart, and provide 4-terminal (Kelvin) measurement.

					  Accessory assembly (provided) allows 4-terminal
					  measurements of large or remote parts.

Excitation Frequency Accuracy . . . . . . +/- 3%

Overvoltage Protection. . . . . . . . . . Input protected against +/- 20 VDC/VAC
					  (5 seconds maximum), or capacitor up to
					  2000 ?F charged to 50 VDC. Higher overvoltage
					  will cause an internal 1-ampere fuse to open.

Display . . . . . . . . . . . . . . . . . 3-1/2 digit (1999 maximum count), .43” high-brightness LED

Sampling Rate . . . . . . . . . . . . . . 2-1/2 per second

Value Out . . . . . . . . . . . . . . . . 0 to +2.0 VDC (+/- 5%), proportional to L, C value,
					  provided at rear panel terminals.

Temperature Coefficient . . . . . . . . . +/- (.1 x Accuracy)/C for L, C
					  +/- (.05 x Accuracy)/oC for D

Operating Temperature . . . . . . . . . . 10 to 40C (50 to 104F)

Storage Temperature . . . . . . . . . . . 0 to 50C (32 to 122F)

Power Requirements. . . . . . . . . . . . 105 - 125 VAC or 210 – 250 VAC, 50/60 Hz, 15 Watts

Dimensions. . . . . . . . . . . . . . . . 3.75” high x 10” wide x 12.5” deep

Net Weight. . . . . . . . . . . . . . . . 6.5 lbs