Tektronix 851 MOD PD BDM 1250 Digital Tester
Comes with manuals and accessories.

General Description:

The 851 Digital Tester is an easy-to-operate first-line service tool used to troubleshoot and maintain a wide range of digital equipment.

With this portabal digital tester, a first-line service engineer can make many of the same measurements that now require and oscilliscope, DMM, counter, time, logic probe, thermometer and special purpose test equipment.

One knob lets you dial 22 functions to perform a wide variety of tests and measurements. Eleven functions measure timing, two register plus and minus peak voltages, three carry out DMM measurements through separate leads and one reads line voltage at the outlet. Another function allows you to take temperatue readings with a temperature probe. The 851 also measures its four input thresholds to adjust to the logic levels of the equipment being serviced.

All functions are completely autoranging and the indicator lights tell you exactly what range is being used.

Characteristics:

Inputs:
Resistance and Capacitance: 10 mohms +/- 1% and approx. 100 pF. Red to black terminal. (Volts only.)
Maximum Safe Input Voltage: +/- 500 V (peak) ACV/DCV (< or = 1 kHz)
Resistance Range: 200 ohms, 2 kohms, 20 kohms, 200 kohms, 2 Mohms, 20 Mohms, and 50 Mohms.

AC Volts (Average responding RMS calibrated for sinewave.):
Ranges: 2 V, 20 V, 200 V, and 350 V.
Accuracy: 2 V and 20 V:
   0.5% or reading +/- 4 counts, 40 Hz to 1 kHz.
   2% or reading +/- 4 counts, 1 kHz to 25 kHz.
   >9% full scale
200 V and 350 V:
   +/- 0.5 % of reading +/- 4 counts, 40 Hz to 1kHz.
   Extended temperature range: add +/- 0.2%.

DC Volts:
Ranges: 2 V, 20 V, 200 V, and 500 V.
Accuracy:    2 V, 20 V and 200 V:
+/- 0.1% of reading +/- 3 counts
500 V: +/- 0.15% of reading +/- 3 counts
   Extended temperature range: add +/- 0.05%.

Line Voltage:
Range: 90 to 132 V and 180 to 250 V
Accuracy: +/- 3% of reading

Temperature:
Range: 55 to +150 degrees C
Accuracy: +/- 2 degrees C (0.01 degree resolution).
   Extended Temperature range: add +/- 1 degree C

Inputs:
(3 probes inputs for A,B,C)
Resistance and Capacitance: 10 Mohms and approximately 12 pF.
Maximum Safe Input Voltage: +/- 500 V at probe tip (< or = to 50 kHz)
Threshold Levels: Variable (4 Controls) range:
   +/- 30 V; setability +/- 10 mV
TTL (nominal, in detend position): Input A LO + 0.7 V; HI + 2.1V; Input B and C + 1.4 V
Input Filter (Narrow Pulse rejection): Maximimum input rep rate for pulse rejection = 20 MHz
Range: Off and 500 ns +/- 20% to >300 ns. Channel to channel delay mismatch: <100% setting.

Positive and Negative

Peak Volts:
Range: +/- 30 V
Accuracy: +/- 2% of reading +/- 3% of p-p signal +/- 90 mV. Maximum time between recurrent peaks, 25 ms. Peak amplitude must be maintained for atleast 25 ns. Extended temperature range: add +/- 1% of reading +/- 1% p-p signal +/- 10 mV

Frequency:
Ranges: 100 kHz (1 Hz resolution), 1 MHz, 10 MHz, and 35 MHz
Accuracy: +/- 0.005% of reading +/- 1 count

Time Measurement:
(Period, pulse width, transition time, time interval, and coincidence time.)
Ranges: 1ms (10 ns resolution), 10 ms, 100 ms, 1 s and 10 s.
Minimum Time Interval: 20 ns
Accuracy: +/- 0.005% of reading +/- 1 count +/- Trigger Error

Counting:
(Totalize, frequency ratio, events count, and transitions count.)
Range: 0 to 99,999
Maximum Input Frequency: 35 MHz (except 17.5 MHz for transition counting).
Accuracy: +/- 1 count, +/- A input event or transition frequency multiplied by the time interval trigger error.

Duty Factory:
Range: 0 to 100%
Input Frequency Range: 40 Hz to 10 MHz
Minimum Pulse Width (HI and LO Portions): 50 ns

Readout:
Type: Five digits, fully buffered seven segment, 0.5 in LEDs
Polarity Indication: + for positive readings, - for negative readings.
Overrange Indiciation: Display Flashes:
Range Indicators: LEDs show function ranges in Ohm, kOhms, Mohms, MHz, kHz, ms, us, and V
Logic State Indicators: Red, yellow, and green LEDs show valid and invalid logic state inputs for CH A. Red and Green LEDs show logic states above or below the threshold set for CH B and C. Any state change indication is sustained long enough to be visible.
Threshold Lock Indicator (LO > HI): Red LED indicates when CH A LO and HI threshold are locked together (LO threshold setting is higher than the HI setting).

$20.00 Minimum for shipping, handling, and order processing.

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