Operating Manual EMI TEST RECEIVER ESIB7 - Rohde & Schwarz

ESIB
Receiver - Operation on a Discrete Frequency
Preamplifier
In the frequency range up to 7 GHz, ESIB is provided with a switchable preamplifier of 20 dB gain.
Option ESIB-B2, Preamplification, extends the frequency range for preamplification to 26.5 GHz or
40 GHz.
Switching on the preamplifier reduces the total noise figure of ESIB and thus improves the sensitivity.
The disadvantage of a poorer large-signal immunity (intermodulation) is reduced by the connected
preselector. The signal level of the subsequent mixer is 20 dB higher so that the maximum input level is
reduced by the gain of the preamplifier. The total noise figure of ESIB is reduced from approx. 18 dB to
approx. 10 dB when a preamplifier is used. The use of the preamplifier is recommended when
measurements with a maximum sensitivity are to be performed. On the other hand, if the measurement
should be performed at maximum dynamic range, the preamplifier should be switched off.
The gain of the preamplifier is automatically considered in the level display. The preamplifier follows the
preselection filters so that the risk of overdriving by strong out-of-band signals is reduced to a minimum.
CONFIGURATION MODE - EMI RECEIVER menu
PREAMP
ON OFF
The PREAMP ON/OFF softkey switches the preamplifier on and off.
IEC/IEEE-bus command :INPut:GAIN:STATe ON | OFF
Setting the IF Bandwidth
ESIB offers the IF bandwidths (6 dB bandwidths) 10 Hz, 100 Hz, 200 Hz, 1 kHz, 9 kHz, 10 kHz, 100
kHz, 120 kHz, 1 MHz and 10 MHz.
The IF filters up to 1 kHz are digital Gauss filters. They behave like analog filters.
The 9 kHz and 10 kHz bandwidths are obtained by decoupled crystal filters and the bandwidths between
100 kHz and 1 MHz by decoupled LC filters. These filters contain 5 filter circuits.
The 10 MHz filter is a critically coupled LC filter.
CONFIGURATION MODE - EMI RECEIVER menu
RES BW
The RES BW softkey activates the manual entry mode for the resolution
bandwidth.
For numerical inputs, the values are always rounded to the next valid bandwidth.
For rollkey or the UP/DOWN key entries, the bandwidth is adjusted in steps
either upwards or downwards.
When the quasi-peak detector is switched on, a fixed bandwidth is preset
depending on the frequency. However, the coupling of the IF bandwidth to the
frequency range can be cancelled using softkey QP RBW UNCOUPLED.
The bandwidth is limited by the set receive frequency:
RES BW ≤ f in /2
IEC/IEEE-bus command
:[SENSe:]BANDwidth:RESolution
1088.7531.12 4.79 E-15