Tenma 72-6859 User Manual

72-6859

20MHz FUNCTION GENERATOR

INSTRUCTION MANUAL

Tenma 72-6859 Instruction manual

Table of Contents

Introduction 2

Specification 2

EMC 5

Safety 4

Installation 5

Operation 7

Maintenance 8

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Tenma 72-6859 Instruction manual

This instrument is a 20MHz function generator with waveforms of sine, square, triangle, ramp,
pulse and DC from a variable amplitude 50Ω output. A TTL output is also provided.

The frequency range is 0.2Hz to 20MHz selected by an eight decade range multiplier and
calibrated vernier. The sweep input can be used to give a >20:1 frequency change within a
selected range.

The generator output level is 20Vpk-pk maximum from a 50Ω source. The level is set via
switched attenuators plus vernier with a total range of 66dB. DC offset is vernier adjustable over a
±10V range with 0V defined by a centre detent.

A switchable symmetry control with a 6:1 range permits ramp and pulse waveforms to be
produced.

FREQUENCY

Frequency Range: 0.2Hz to 20MHz in 8 overlapping decade ranges with fine adjustment

by a vernier.
Vernier Range: >10:1 on each range.
Vernier Accuracy: Typically ± 5% of full scale.

Introduction

Specification

SWEEP MODE (EXTERNAL)

Sweep Range: Typically >20:1.
Input Impedance:
Input Sensitivity: Typically 0 to 2V for 10:1 sweep.
Maximum Allowable

Input Voltage:
Maximum Slew Rate of

sweep voltage:

OPERATING MODES

(Specifications apply for the top decade of each frequency range and output 10V peak-to-peak
into 50Ω termination).

Sine

Distortion: Typically 2% on 200, 2k and 20k ranges.
Amplitude Flatness: ± 0.2dB to 200kHz; ± 2dB to 20MHz.

Triangle

Linearity: Typically 99% on kHz ranges.

Squarewave

82 kΩ

± 10V

0.1V/us

Rise and Fall Times: <22ns

DC

Range:

±10V from 50Ω

Symmetry

Symmetry Range: Typically variable from 1:6 to 6:1 up to 500kHz.

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