ANSI Exam Study Guide Questions
with Complete Solutions9
What does ANSI stand for? - ANSWERS-American National Standards Institute
What does ANSI specify? - ANSWERS-1. the electroacoustic tests a manufacturer must perform
and publish for each HA before it is shipped out
2. the allowed tolerances for shipped instruments, so that you, the clinician, can perform the
same tests to verify the performance of an instrument against specifications
Testing the electroacoustic performance of hearing instruments serves two general purposes....
- ANSWERS-1. to verify that an instrument is functioning properly (according to the
manufacturers specs)
2. to verify that the instrument is functioning appropriately (according to the wearers auditory
needs)
What are the two types of HA's - ANSWERS-1. linear
2. AGC
What does AGC stand for? - ANSWERS-Automatic gain control
____________ HA is an instrument whose gain is controlled automatically as a function of the
level of the signal being amplified. This automatic control of gain can be used to reduce the
range of output levels as compared to the range of input levels (compression). It can also be
used to increase the range of output levels as compared to the range of input levels (expansion)
- ANSWERS-AGC
Preparing to test ..... what should you do - ANSWERS-1. set to the widest Hz response range
, 2. set to max gain
3. set to max output
4. turn feedback control off
5. turn noise suppression off
6. AGC set to minimum
What does HFA stand for? - ANSWERS-High Frequency Average
The HFA is the average of the dB values at what 3 frequencies? - ANSWERS-1000, 1600, 2500 Hz
What does the HFA reading give you? - ANSWERS-a single number that represents the overall
performance of an instrument for the test conditions in question.
ALL dB LEVELS... not one specific one (the specific one is for the full on gain measurement ....#3)
When do you use an SPA? - ANSWERS-When a HA is not designed to produce "usable" output
levels at all 3 HFA frequencies. A manufacturer may designate that instrument a SPECIAL
PURPOSE hearing aid. In such cases, the manufacturer may specify three alternate frequencies
to be considered for averaged measurements
#1 Output Sound Pressure Level (OSPL90)
OSPL90 is a reflection of the HA's ________1______. It's goal is to _______2_______ the HA -
ANSWERS-1. max possible output (MPO)
2. saturate
What are the 3 measurements that you can obtain from the OSPL90? - ANSWERS-1. OSPL90
curve (response)
with Complete Solutions9
What does ANSI stand for? - ANSWERS-American National Standards Institute
What does ANSI specify? - ANSWERS-1. the electroacoustic tests a manufacturer must perform
and publish for each HA before it is shipped out
2. the allowed tolerances for shipped instruments, so that you, the clinician, can perform the
same tests to verify the performance of an instrument against specifications
Testing the electroacoustic performance of hearing instruments serves two general purposes....
- ANSWERS-1. to verify that an instrument is functioning properly (according to the
manufacturers specs)
2. to verify that the instrument is functioning appropriately (according to the wearers auditory
needs)
What are the two types of HA's - ANSWERS-1. linear
2. AGC
What does AGC stand for? - ANSWERS-Automatic gain control
____________ HA is an instrument whose gain is controlled automatically as a function of the
level of the signal being amplified. This automatic control of gain can be used to reduce the
range of output levels as compared to the range of input levels (compression). It can also be
used to increase the range of output levels as compared to the range of input levels (expansion)
- ANSWERS-AGC
Preparing to test ..... what should you do - ANSWERS-1. set to the widest Hz response range
, 2. set to max gain
3. set to max output
4. turn feedback control off
5. turn noise suppression off
6. AGC set to minimum
What does HFA stand for? - ANSWERS-High Frequency Average
The HFA is the average of the dB values at what 3 frequencies? - ANSWERS-1000, 1600, 2500 Hz
What does the HFA reading give you? - ANSWERS-a single number that represents the overall
performance of an instrument for the test conditions in question.
ALL dB LEVELS... not one specific one (the specific one is for the full on gain measurement ....#3)
When do you use an SPA? - ANSWERS-When a HA is not designed to produce "usable" output
levels at all 3 HFA frequencies. A manufacturer may designate that instrument a SPECIAL
PURPOSE hearing aid. In such cases, the manufacturer may specify three alternate frequencies
to be considered for averaged measurements
#1 Output Sound Pressure Level (OSPL90)
OSPL90 is a reflection of the HA's ________1______. It's goal is to _______2_______ the HA -
ANSWERS-1. max possible output (MPO)
2. saturate
What are the 3 measurements that you can obtain from the OSPL90? - ANSWERS-1. OSPL90
curve (response)
