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5-55
© Sage Instruments 2000
9100-2930-02 01/31/00
Sage Instruments 930i Communications Test Set
5-19 OPTION MENU #:19 4-TONE INTERMODULATION DISTORTION
OPTION MENU #:19, 4-TONE INTERMODULATION DISTORTION, is available only when
Purchased
Option 930i-100, Data Test Package, is installed. Intermodulation Distortion (IMD) measures the 2nd
and 3rd order distortion products created in a nonlinear circuit in the presence of a 4-tone signal.
Inter Modulation Distortion, sometimes referred to as Non-Linear Distortion or 4-Tone Intermod, is
an end-to-end measurement. That is, one test set sends the tone pairs at 857 Hz, 863 Hz and 1372 Hz,
1388 Hz while the other set has its receiver looking at a band of frequencies centered around 520 Hz,
2240 Hz, and 1900 Hz. The energy received in these filters constitutes the energy in the 2nd and 3rd
order IMD products.
On 4-wire circuits, a loopback can be inserted at the distant end so that one set may send and receive.
On a 2-wire circuit, two sets are required, with one set either sending, or receiving, in turn.
To test for intermodulation distortion:
1. Connect the 930i to the circuit.
2. Press the Option Menu function key.
3. Use the Up/Down Arrow keys to scroll through the option menus, OR select 19 using the
numeric keypad and then press the Option Menu function key. The display reads:
OPTION MENU #: 19 4-TONE INTERMODULATION
K1
K2
K3
K4
4. Press ENT or any soft key (K1-K4) to activate your selection. The display reads:
4-TONE INTERMOD: SEND MEASURE EXIT
K1
K2
K3
K4
5. Press K2 under
SEND
to transmit and adjust the IMD tones being sent, to select the signal-to-
noise test tones, or to send the Intermod tones over a 2-wire circuit. The display reads:
SEND: S/N TEST 4-TONE -16dBm EXIT
K1
K2
K3
K4
6. Press K1 under
S/N TEST
to send the signal-to-noise test tones. This will suppress one tone
pair while amplifying the other pair to maintain the same average level. This measurement is
usually performed before IMD testing; the 930i uses the S/N value to automatically correct the
IMD measurement results for the noise in the same bands.
Option Menu #:
19
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Summary of Contents for 930i
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