9 kHz to 30 MHz -30 to +137 dBiaV Field-strength measure men is in conjunction with test antennas Radio-interference (EMI) measurements to CISPR, VDE and FCC regulations Interference (EMI) measurements to MIL and VG regulations Radiomonitoring, remote frequency measurements Selective voltage measurements in laboratory and test department The Test Receiver ESH 3 demodulates and measures AM double-sideband, single-sideband, PM and FM signals, as well as sinusoidal and impulsive interference, over the range 9 kHz to 30 MHz. High overload capacity, wide dynamic range, manifold measuring and evaluation capabilities, and numerous available accessories make the ESH 3 suitable for selective voltage and two-port measurements - also in automatic test systems - and for all applications in the field of radiomonitoring (page 5) and EMC (electromagnetic compatibility - EM! measurements - page 4), Selective voltmeter. Its wide measurement range of -30 to + 137 dB(W permits the use of the Test Receiver ESH 3 as an automatic high-precision selective voltmeter in the labo- ratory, test department and service workshop without any accessory units. For high*impedance test items the Active Probe ESH 2-Z2 can be supplied. The Clamp-on RF Current Probe ESH 2-Zt is available for measuring RF current in electric conductors. Excellent receiver selectivity makes it possible to measure signals of targe level differences to a high degree of accuracy even when there are many signals present. Possible applications: SSB two-tone measurements, measurement of harmonics, non-harmonic spurious signals and sideband noise on generators, intermoduiation and crossmodufatson measurements on RF modules. In all these applications the ESH 3 can be set either to low-noise or low-distortion measurement. Automatic linearity testing permits an inherent non-linearity to be distinguished from that of the test item. Other features • Synthesizer-based design offers frequency setting.and readout to crystal accuracy - resolution 100 Hz • Automatic frequency scanning with selectable stai.rt and stop frequencies and step sizes - recording of measured results on printer and/or XV recorder {VDE/FTZ/Mi.L chart paper can be used) • Accuracy in compliance with CCiR recommendations • Automatic calibration of level and frequency offset measurements; frequency response and bandwidth correction values are automatically taken into consideration, making for optimum speed and accuracy of level measurements • Automatic measurement of voltage, field strength, current, pulse spectral density, and two-port attenuation, with indication of respective physical unit; conversion factors for probes and test antennas and bandwidth correction values are automatically taken into consideration • Digital data output in p.V to V, dBjiV, dBm and corresponding units for current field strength, and pulse spectral density • High overload capacity, outstanding overall selectivity, automatic indication when overdriven; automatic linearity test triggered at thè push of a key • Programmable measuring times of 5 ms to 100 s for average-vaiue and peak-vaiue indication; determination of RF input levei variation (MAX./MIN. as in cases where fading occurs) with programmable measuring times • Two*port and remote frequency measurement capability • Additional signal evaluation capabilities; frequency-offset, modulation-depth and frequency deviation • Storage of 9 complete device settings and 5 range limits for automatic frequency scanning; stored contents and last device setting are preserved when the receiver is switched off or the current supply is interrupted • Remote-controlinterface conforming to IEC 625-1 {IEEE 488} for universal application; Talk-Only Mode fordata output to IEC(IEEE)-bus-compatible printer without using a controller Calibration generator. The calibration generator output providing SOdBjiV ±0.5dB into 50 Q at receiver centre frequency is ideally suited for measuring the frequency response of amplifiers and fillers. The attenuation measurement range extends to 110 dB and the gain measurement range to 57 dB. The RF Current Probe ESH 2-Z1 permits easy measurement of the shielding effectiveness of cables. The return loss of two-terminal networks (e. g. antennas) and cf four-terminal networks can be measured with the calibration generator in conjunction with a VSWR bridge. In the remote frequency mode it is possible to connect a frequency counter to the generator output for exact (remote) frequency measurement of the signal received by use of the reconversion principle. Signai evaluation © Four switchable IF bandwidths: 0.2/0.5/2.4/10 kHz ® Average, peak and puise weighted {CISPR PubL 1 and 3) indication with programmable measuring times © Switch-selected demodulation modes A0, A1, A3, A3J (USB, LSB), F3 - built-in loudspeaker and phones output © Analog indication of level and frequency offset in addition to the digital data output ® Indication of RF input overload or overloading of other essential stages and automatic linearity test at the push of a key # Broadband 75-MHz IF output forconnection of panoramic adapter or spectrum analyzer @ Narrowband 30-kHz IF output for connection of oscilloscope # AM and FM demodulator outputs ® Recorder outputs for level and frequency offset S Generator output for signal frequency measurement @ Digital measurement of modulation depth, frequency offset and deviation attenuation curves can be readily output on an XY recorder (Figs. 1 and 2). The start and stop frequencies and maximum and minimum levels set on the ESH 3 define the recorder writing area. The frequency axis can be either linear or logarithmic. VDE/FTZ/MIL or the user’s own chart paper can be used.