Model 3988 & Reliability Guaranteed

If you work in an industry that requires the use of signals, you're aware that reliable instruments are needed to assist you with more easily accessing and singling out those signals. The model 3988 is just the instrument that can make accessing the specific signals that you need easier. Here is an overview of model 3988 and how it can simplify your work, regardless of the industry you work in.

What is Model 3988?

Model 3988 is a dual-channel filter that allows users to perform various applications. Whether you're using a Butterworth or Bessel filter, model 3988 accommodates both. This filter can be used in a variety of industries, including engineering (biomedical, noise control, and acoustic), geophysicists, environmental scientists, and more. Here are the specifications of the model 3988:

General Specifications:

Filter Types: Butterworth and Bessel
Frequency Range:
- Low-Pass: 0.03 Hz to 1 MHz
- High-Pass: 0.03 Hz to 300 kHz
- With 002 Option: Down to 0.003 Hz
Attenuation Slope: 48 dB per octave
Gain: Up to 70 dB in 0.1 dB steps
Input Types: Differential and single-ended
Coupling: Selectable AC or DC

Input Specifications:

Impedance: 1 MΩ (differential), 500 kΩ (single-ended)
Maximum Input Voltage: ±10 V peak

Output Specifications:

Impedance: 50 Ω
Maximum Output Voltage: ±10 V peak
Offset Voltage: Adjustable to ±10 V

Power Requirements:

Voltage: 100-240 V AC, 50-60 Hz
Power Consumption: 30 W

Physical Specifications:

Dimensions: 3.5" H x 8.5" W x 13.5" D (89 mm x 216 mm x 343 mm)
Weight: 10 lbs. (4.5 kg)

Environmental Specifications:

Operating Temperature: 0°C to 50°C
Storage Temperature: -40°C to 75°C
Humidity: Up to 95% non-condensing

Common Applications of Model 3988

Model 3988 is a highly versatile filter, allowing many common applications. Here are some of the applications you can expect to utilize with this model:

Random Noise Testing - The Model 3988 successfully filters out undesired noise, making it beneficial in testing workplaces where clarity is critical.
Ultrasound Testing - This particular model is ideal in a number of medical and industrial environments, as the device effortlessly filters high-frequency signals.
Biomedical Industry Usage - Just like model 3988 is frequently used in medical environments, it's also used in the biomedical industry. This is because the 3988 can effectively filter ECG and EEG.
Vibration Analysis - The filter is exceptionally precise, which enhances users' ability to analyze vibrations in mechanical systems, which is essential when making diagnoses for maintenance.
Monitoring of Environmental Conditions - This particular instrument can be used to monitor and filter environmental data, including atmospheric conditions and seismic activity.
Audio Communications - The model 3988 allows professionals to attain optimal sound quality in communications by efficiently refining audio signals.

What Sets Model 3988 Apart from Other Filters?

There are several reasons why the model 3988 is superior to other filters. One main reason is its dual-channel design system, which many users find convenient. Having two separate channels enables professionals to use two different filters simultaneously or combine both channels for enhanced band-pass or band-reject capabilities. Another reason that model 3988 is set apart from other filters is due to its extensive frequency range. With a tunable frequency range from 0.03Hz to 1MHz in low-pass mode and a high-pass mode that reaches 300kHz, model 3988 allows professionals almost limitless access to frequencies. There is also the option to utilize an optional feature that enables users to extend the range down to 0.003Hz. Additionally, model 3988's dynamic programmability is yet another reason many professionals prefer this particular filter. With the ability to utilize up to 99 groups of non-volatile memory to store previous setups, users easily recall specific configurations. This saves time by reducing the need to enter configurations each time. Furthermore, model 3988 offers extremely high precision, with attenuation slopes of 48dB per octave and 8-pole filtering. Finally, the model 3988's gain control is an additional aspect of this filter that makes it superior to similar devices. Each of the device's channels furnishes up to 70dB in 0.1dB steps, with pre- and post-filter gain modification.

Using the Model 3988

It's easy to get started using the model 3988. Once you've securely mounted this benchtop device and attached all the accompanying cables, you need to plug it into a power source and power it on. The power switch is located on the front panel. Next, you would:

Connect your inputs and outputs - You can use differential or single-ended inputs
Connect the output - Attach the output to your recording or measurement device
Select your desired frequency and filter type - Again, you can use Butterworth or Bessel. The frequency control knobs are located on the front of the device, and they can be used to attain the desired frequency
Adjusting the gain - To position the gain, set the pre-and post-filter gain using the gain control knobs. Each channel allows you to access gains up to 70dB in 0.1dB steps
Testing & Fine-Tuning Your Device - Finally, you will need to test and fine-tune your filter to ensure it meets your needs. This will require you to test out different signal settings to determine which ones work best for your type of work

Krohn-Hite has been in business since 1949 for an impressive 75 years, and since then, we have been manufacturing top-of-the-line instruments that accurately and efficiently measure, amplify, condition, and more. So, if you're in the market for an advanced and reliable filter, model 3988 might just meet, or even exceed, your expectations.