Krohn-Hite 1200A User manual

Model 1200A
Linear Sweep/Function Generator
0.2Hz to 3MHz
Serial No. _______________________
Operating Manual
Copyright 2004. All rights re served. Con tents of this pub li ca tion may not be re pro duced in
any form with out the writ ten per mis sion ofKrohn-HiteCorporation.Re vi sion 063004. Printed
in U.S.A.
15 Jonathan Drive, Unit 4, Brockton, MA 02301-5566
Tel: [phone]; Fax: [phone]
[e-mail]; www.krohn-hite.com

Table of Contents
1.0 GENERAL DESCRIPTION ·························1-1
1.1 INTRODUCTION ································1-1
1.2 SPECIFICATIONS ·······························1-1
1.2.1 Waveforms ...............................1-1
1.2.2 Frequency Range ...........................1-1
1.2.3 Frequency Control ..........................1-2
1.2.4 Frequency Accuracy .........................1-2
1.2.5 Main Output ..............................1-2
1.2.6 Operational Modes ..........................1-3
1.2.7 Sweep Characteristics ........................1-3
1.2.8 External Frequency Control (VC) ................1-3
1.2.9 Variable DC Offset ..........................1-3
1.2.10 TTL Output...............................1-4
1.2.11 Control Voltage (CV) Output ...................1-4
1.2.12 Operating Ambient Temperature Range .............1-4
1.2.13 Controls.................................1-4
1.2.14 Terminals ................................1-4
1.2.15 Power Requirements .........................1-4
1.2.16 Dimensions and Weights . . . . . . . . . . . . . . . .......1-5
1.2.17 Optional Rack Mounting Kit (see Figure 2) ..........1-5
2.0 OPERATION···································2-1
2.1 POWER REQUIREMENTS ··························2-1
2.2 OPERATING CONTROLS AND CONNECTORS (see Figure 3) · · · 2-3
2.2.1 Front Panel ...............................2-3
2.2.2 Rear Panel ...............................2-4
2.3 OPERATION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 2-5
2.3.1 Frequency Hz/Stop Freq Dial and Multiplier .........2-5
2.3.2 Internal Sweep Operation. . . . . . . . . . . . . . . .......2-5
2.3.3 External Frequency Control (VC) ................2-6
2.3.4 Variable DC Offset ..........................2-6
2.3.5 Calibrated CV (Control Voltage) Output ............2-6
2.3.6 Waveguard Circuit ..........................2-7
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Table of Contents

3.0 INCOMING INSPECTION AND CHECKOUT ·············3-1
3.1 INTRODUCTION ································3-1
3.2 EQUIPMENT REQUIRED ··························3-1
3.3 PROCEDURE ··································3-2
3.3.1 Waveforms ...............................3-2
3.3.2 Amplitude Control ..........................3-2
3.3.3 DC Offset................................3-2
3.3.4 Frequency Controls and Accuracy ................3-2
3.3.5 External Voltage Control (VC) ..................3-2
3.3.6 CV Output ...............................3-3
3.3.7 Sweep Operation ...........................3-3
3.3.8 Frequency Response .........................3-3
3.3.9 Sinewave Distortion .........................3-3
3.3.10 TTL Output...............................3-4
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Table of Contents

Notes
iii
Notes

iv
Mdeol 1200A Photo
Figure 1. Model 1200A Linear Sweep/Function Generator

Section 1
GENERAL DESCRIPTION
1.1 INTRODUCTION
The Krohn-Hite Model 1200A, il lus trated in Fig ure 1, com bines a func tion gen er a tor and ramp gener-
a tor in one in stru ment. An ex clu sive fea ture of the 1200A is WAVEGUARDä, a unique out put protec-
tion cir cuit that pro tects the gen er a tor’s MAIN (HI) OUT PUT from dam age, if a volt age is acciden-
tally placed across the output termi nals. The WAVEGUARDcir cuitre cov ersau tomat i callywhen the
external voltage isre moved.
The main gen er a tor pro vides sine, tri an gle and square wave forms from 0.2Hz to 3MHz. Fre quency is
con trolled by the tun ing dial, cal i brated in Hertz from .2 to 30 (1500:1) plus a 3 band, de cade multi-
plier. A fine-tune vernier provides ±2.5% adjustment of the dial setting. Frequency may be also con-
trolled externally by an AC or DC voltage ap plied to the ex ter nal volt age con trol (VC) in put.
The aux il iary ramp gen er a tor am pli tude is con tin u ously ad just able from 5mV p-p to 20 volts p-p,
open-circuit. Out put im ped ance is a con stant 50 ohms. A si mul ta neous LO (-20dB) out put is also
provided.
Ad di tional fea tures in clude: ±10V vari able DC off set, aux il iary TTL out put and a cal i brated CV (con-
trol volt age) out put, pro por tional to the main gen er a tor fre quency.
A Rack-Mounting Kit, part No. RK-39, is also available.
The gen er a tor is care fully in spected, aged and ad justed be fore ship ment, and should ready for opera-
tion when it is unpacked. If it appears to have been damaged in ship ment, file a claim with the freight
car rier, and no tify Krohn-Hite or its near est sales of fice im me di ately.
1.2 SPECIFICATIONS
1.2.1 Waveforms
Sine, tri an gle, TTL, ramp.
1.2.2 Frequency Range
0.2Hz to 3MHz.
1-1
Section 1 - General Description

1.2.3 Frequency Control
Single turn dial calibrated logarithmically from 0.2 to 300 in Hertz, and a 3 positionmultiplier pro vid-
ing a 1500:1 coverage in each multiplier position. Sep a rate fine-tune ver nier pro vides 5% adjustment.
BAND MULTIPLIER FREQUENCY RANGE (Hz)
1 1 0.2 – 300
2 100 20 – 30k
3 10K 2k – 3M
1.2.4 Frequency Accuracy
±5% at three dial cal i bra tion set tings of 10, 100 and 300; ±20% max i mum at other set tings.
1.2.5 Main Output
1.2.5.1 Waveforms
Sine, square, triangle.
1.2.5.2 Output
HI LEVEL (0dB): 20 volts p-p open-circuit, 10 volts p-p across 50 ohms.
LO LEVEL (-20dB): 20 volts p-p open-circuit, 1 volt p-p across 50 ohms.
1.2.5.3 Isolation
Can be floated up to ±200 volts peak be tween out put and in stru ment case.
1.2.5.4 Amplitude Stability (Maximum Amplitude)
10 min utes, 0.02%; 24 hours, 0.1%
1.2.5.5 Amplitude Control
Infinite resolution vernier. Minimum output less than 5 millivolts.
1.2.5.6 Frequency Response
Sine wave, less than 0.1dB from 0.2Hz to 300kHz; 1.0dB to 3MHz.
1.2.5.7 Sine Wave Distortion
Less than 0.5% from 2Hz to 300kHz; 3% to 3MHz.
1.2.5.8 Square Wave
Rise and fall time, less than 40ns; to tal abberations less than 5% with 50 ohm ter mi na tion.
1-2
Section 1 - General Description

1.2.5.9 DC Components
All waveforms are normally symmetrical about ground with nom i nal zero DC volts. At max i mum
out put, drift is less than 5 mil li volts per de gree C.
1.2.5.10 Triangle Linearity
Greater than 99% from 0.2Hz to 300kHz; 95% to 3MHz.
1.2.5.11 Time Symmetry
Sine, square, tirangle 99% from 0.2Hz to 300kHz.
1.2.6 Operational Modes
Continu ous orlinear sweep.
1.2.7 Sweep Characteristics
1.2.7.1 Sweep Range:
Maximum 1500:1 up or down; upper and lower limits set by tun ing dial and START FRE QUENCY
control.
1.2.7.2 Sweep Duration
1000s – 1ms in two ranges; 1000s – 1s, 1s – 1ms.
1.2.7.3 Ramp Output
+5V peak sawtooth, frequency adjustable with DURATION control, .002Hz – 1kHz. Ramp retrace,
less than 75ms. Output impedance, constant 600 ohms.
1.2.8 External Frequency Control (VC)
1.2.8.1 Range
1500:1.
1.2.8.2 Voltage Control Range
Zero to ±3volts. (A max i mum of ±25 volts may be ap plied to the VC in put with out dam age to the cir
-
cuitry).
1.2.8.3 Input Impedance
10k ohms.
1.2.9 Variable DC Offset
±10 volts open-cir cuit, ±5 volts across 50 ohms. Push-but ton ON-OFF Con trol with sep a rate vernier.
(Reduced by –20dB on LO output).
1-3
Section 1 - General Description

1.2.10 TTL Output
TTL pulse at generator fre quency, drives up to 10 TTL loads; rise and fall times less than 15ns.
1.2.11 Control Voltage (CV) Output
+2mV to 3 volts, proportional generatorfrequency.
Ac cu racy, better than 5%. Out put im ped ance, 600 ohms.
1.2.12 Operating Ambient Temperature Range
-10°C to 45°C.
1.2.13 Controls
Front panel contains FREQUENCY dial, frequency VERNier, STARTFRE Quency,DU RATION,
AM PLI TUDE, DC OFF SET and push-but ton con trols for fre quency range MUL Ti plier, MAIN OUT-
put wave form se lec tor, SWP on, sweep range mul ti plier, and POWER switch. Rear panel con tains
LINE switches, SYMmetry ADJust, DC LEVEL AD Just ment and GROUND switch.
1.2.14 Terminals
Front panel only, BNC con nec tors for HI and LO out puts, TTL out put, CV out put, RAMP out put, and
VC input.
1.2.15 Power Requirements
Switch selectable, 90-110, 108-132, 180-220, or 216-264 volts, sin gle phase, 50-400Hz, 13 watts.
1-4
Section 1 - General Description