FS (US): Fluke 8375A Digital Multimeter & Hewlett-Packard 5216A Frequency Counter

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FS (US): Fluke 8375A Digital Multimeter & Hewlett-Packard 5216A Frequency Counter

Fluke 8375A 5.5-Digit Digital Multimeter 100mV-1kV Voltmeter Benchtop DMM/DVM - $95.00
Located Arlington, TX, USA.

Physical Condition: Good - some stains on the front panel. The front panel and controls are in good physical condition.
Functionality/Degree of Testing: Unit powers on. Display and controls are responsive, and the multimeter appears to read correctly. Includes PDF of operation manual and schematics.
Dimensions (L" * W" * H"): 17 3/8 x 17 � x 4
Weight - about 20 pounds

The Fluke Model 8375A is a versatile digital multimeter with five full decades of digits plus a sixth digit for 20% overrange. The instrument offers five ranges of dc voltage measurement including autorange, autopolarity, and switchable active filtering. Four ranges of true rms ac voltage measurement and seven ranges of resistance measurement are also included.
Fluke's Recirculating-Remainder A/D conversion technique is used in the 8375A. This conversion circuitry periodically samples the input and serially digitizes the sample, providing a reliable instrument with high long-term accuracy and linearity plus superior environmental characteristics.
DC voltages are measured on five ranges with up to one microvolt of resolution. Overranging of 20% with 1100 volt overload capability further characterizes these ranges. A non-blinking readout contains an in-line readout tube display showing polarity, overrange digit, and five full decades of digits followed by a lighted function annunciator. The speed at which the readout updates is controlled by a sample rate control.
True-rms ac voltages to 1100 volts are measured on four ranges over a frequency domain of 10 Hz to 100 kHz with up to 10 microvolts resolution. Also, proper measurement of waveforms with high distortion and high crest factor characteristics can be made with this true-rms converter.
True four-terminal resistance measurements on the 10-ohm through 10K-ohm ranges are made with low power dissipation in the unknown resistor. The instrument autoranges through all resistance ranges, from 10 ohms to 10 megaohms, with up to 100 microoohms resolution.
Pushbutton selection, 1000-volt guarding, full autoranging, instantaneous auto-polarity, and calibration of all functions through the top guard cover are standard features of the 8375A.
Isolated four-terminal DC/DC ratios are measured in real time via the DC External Reference option. The Reference input LO terminal may be elevated by as much as + 13V from the input LO terminal without loss of ratio accuracy. Furthermore, the standard reference voltage span of +IV to +10.5V permits measurement of ratios from a wide number of sources. Special reference voltage ranges are available on request.
Isolated Data Output and Isolated Remote Control options use guarded toroids to transfer data and commands to and from the 8375A with no degradation of common-mode rejection specifications. These options are also DTL/TTL compatible and are designed to permit multiplexing of several 8375A's on common sets of control and data output lines. Moreover, they are buffered to prevent interaction between the DMM and the acquisition/control devices.
External Triggering of the 8375A is accomplished via its Data Output Unit, and resulting data may be acquired fully in parallel BCD format or serially by character in multiples of four bits. A single control line enables automatic time delays that allow for full settling of the analog input prior to digitization of the data transferred. Five flags provide continuous measurement status information for the acquisition device.
Remote Control is exerted by contact closures or logic levels. The 8375A's Control Command Storage feature permits the 8375A to latch on commands, which may be later removed from inputs while the 8375A retains the commanded function and range in internal memory.
The 8375A operates on 115 or 230 volts, 50 Hz to 440 Hz ac power. Before applying power to the instrument, note the position of the 115/230 volt slide switch at the rear of the instrument (Figure 2-1). If the switch does not indicate the desired operating voltage, place it in the correct position.
The 8375A is supplied with non-marring feet and tilt-down bail for bench or field use. Includes rack pull-out handles.


Hewlett-Packard 5216A 12.5MHz Frequency Counter - $75.00
Located Arlington, TX, USA.

Nice little 7-digit Frequency Counter from 1967-1970 era, with smaller Nixie tubes. Range up to 12.5MHz. Seems to work fine.
Manufacturer: Hewlett-Packard
Model: 5216A
Year: 1967
RANGE: 3 Hz to 12.5 MHz.
DISPLAY: Long-life Nixie with display storage and blanking.
Digits: 7
Logic: TTL
An early all-IC counter. The main ICs used in this counter are MSI TTL decade counters and NIXIE drivers. They are proprietary HP devices having some additional functionality not found in the standard 7490 / 7441 devices.
The additional functionality of the ICs is for leading-zero blanking in the display. The decade counter ICs have an 11th state (decimal 15) to represent blanked-zero. The NIXIE driver IC blanks the NIXIE upon input of 15. Upon reset the decade counters are set to the blanked-zero state. Any clock activity on a given decade (digit) unblanks that decade. At the end of the gate/count period leading zeroes are still blanked while lower-order zeroes have been unblanked. This scheme can result in some briefly idiosyncratic displays when changing the function mode.
An innovation is the zero suppression capability featured in both new integrated counters. All insignificant zeroes (i.e. those to the left of the most significant digit) are suppressed and the columns at the left side of the display are dark until they have received a carry pulse from the preceding decade counter. Although it conveys no new information, zero suppression provides a simplified and uncluttered readout with less chance for errors in reading the display.
Whether any given decade will have zero suppression at any given time depends on where the corresponding digit is in relation to the decimal point on the display. Digits to the right of the decimal point and the first digit to the left would not have their zero-suppression circuits enabled. There is also a rear-panel switch for overriding zero suppression in all decades. When a decade is not to have zero suppression it receives a control signal from logic circuitry which monitors the position of the decimal point and the rear-panel switch.
Also has a rear-panel connector for interfacing with a computer, although it pre-dates the HP-IB or IEEE-488 standards.
DISPLAY TIME: 50 ms to 5 s or hold until manual reset.
INPUT SENSITIVITY: O.Ol V rms sine wave, max. sensitivity; 30 mV peakpulse, min. pulsewidth 4 0ns. Front panel sensitivity control - step attenuator (0.01, 0.1, 1, 10V settings).
IMPEDANCE: Approx. 1 Mil shunted by 50 pF.
OVERLOAD: Input voltage should not exceed 60dB above attenuator setting or 300 V rms (damage level).
CONNECTORS: At both front and rear panels.
SIGNAL POLARITY: Front panel trigger level control allows counting either positive or negative input pulses.
OPERATING TEMPERATURE RANGE: 0°C to +50°C.
TIME BASE FREQUENCY: 10 MHz.
EXTERNAL TIME BASE INPUT SENSITIVITY: 1V rms sinewave into 1000 ohms (10V rms maximum).
RANGE: 1 kHz to 2 MHz, sine wave.
TIMEBASE OUTPUT: 1MHz, 3V p-p minimum open circuit: source impedance is 2000 Ohms
FREQUENCY MEASUREMENT RANGE: 3 Hz to 12.5 MHz.
WEIGHT: Net. 7 Ibs. Shipping Weight: 10 lbs.
POWER REQUIREMENTS: 115/230 V ±10%, 50 to 1000 Hz, 20 W max.
1967 PRICE: HP Model 5216A, $925.
 

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